SACRAMENTO — A Contra Costa County man was sentenced Monday to more than 11 years in prison for running a massive marijuana operation near Auburn, authorities said.

Authorities say Adolfo Valencia Alvarez, 49, negotiated with undercover agents in November 2008 to use a property in Todd Valley outside Auburn to grow and distribute marijuana.

Agents seized approximately 10,000 marijuana plants from the site during a raid in July 2009, ending in the arrest of multiple workers, including one in possession of a .22-caliber pistol, according to authorities.

On Monday, U.S. District Judge William Shubb sentenced Alvarez to 11 years and three months in prison, according to the U.S. Attorney’s Office.

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